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CHARLES H. 'THURSTOM OF MARLBORO., NEW HAMPSHIRE.

Letters I.Patent No. 77,550, daten? May 5, 1.868.

IMPROVBD MQDE 0F ATTAGHING KNOBS T0 SGREWS.

titte .,tlgtmle tefemh tu' ity time tittns @rient nth mating gatti-nf tlg: same.

TO .ALL WHQM IT MAY CVGNCERN:

Be it known that I, CHARLES H. THURSTON, of Marlboro, in 'the county o'f Cheshire, and State of New Hampshire, have invented a new and usefullmprovement in Attaching Wooden Knobs, Handles, &c., to F'urv niture andother Articles; and d hereby declare that the following is a full, clear, and exactdescripton thereof, reference being had'to the annexed drawings, making'a part of this specification, in which- Figure 1 represents-a screw ready for-insertion into a kn'ob, and

Figure 21's aiseetionalview of a knob, showing the screw secured therein. i

Mineral knobs are usually made (for greater eonye'nience'in attaching) with screws secured in them, which are inserted in 'themwhile the materialof which ysu'ehknobs are formed'is in a molten or plastic state, so that when they are applied for.use, no screw other fastening is leftv .in sight to detractifrom the coinelness of the work. But in knobs andsiniilar articles made of wood, it is not convenient to secure. the screws in them; and for wantof a. better way', it i's usual, -iu attaching them to drawers, doors, ceilings, 86e., to pass a screw through the knob, intothe article to which it is attached, or, viceversa', through the article into the knob, which 'often leaves the head of the screw in a place where itfmakes an unsightly appearance, besides which, itis usually' much more convenient to attach'kuobs having-the screws secured in them; and'niy invention consists of n.

inethod of securing-screws in vwooden knobs and other similar articles, which vI do by providing a double-ended serewywith a'slot inthe thread at one end, 4for theinsertion oi' a. key or spline, so. that after the screw is turned into the knob or other article, andy the key is insertedin the fslot,it cannot beturned ontLbut will remain in its place-when taking the knob from the/rticleto which it'is secured, asshown in iig. `2. The screw may be formed* by any suitable means, which `any one skilled in the art' of working metals-would readily dvise, the princ palrequisite being' to form the slot .for the insertion of the keyl so that the screw will always be firmly held in' place by it, so that knobsmay be attachedfor use simply by turning thefscr'ew intothe article to whichfit is applied, and leaving no part of' the screw in sight.

WhatvI claim as myA invention, and desire to secure by Letters Patent,- is v j The construtionof the'attaching-screws in a wooden knob, by the formation ot a slotted screw and key, causing it to remain in place, substantially as herein shown and described. f CHARLES'H. THUESTON.

Witnesses:

. JAMES TowNsnnn,

JAMEs F. `TowNsEND. 

